Nair bhai, I cant stand the Congress myself, but bro, she is a Christian, why shouldn't she show respect to a priest? And she is wearing a sari and covering her head. That is not Christian, that is Hindu.
If you want her to be a true Indian woman/wife, and be true to her husband's faith over her own, that too is not Hindu.
Notwithstanding the political "conversion" to Hinduism (did not know that was possible) by Rajiv's father before marrying Indira on Nehru's insistence, he was a Parsi.
So either Rajiv's Hindu mother was wrong in not following/respecting her husband's faith, or Rajiv's Christian wife was wrong in not following/respecting his. Cannot be both.